Abstract: There is provided an engine controller that prevents the engine operation from being continued due to a throttle valve recovery failure. When a throttle lever is in the unoperated state and the engine revolution higher than a set revolution has remained for a set duration, the engine controller decides that the recovery failure of a throttle valve has occurred and performs a control to stop the operation of the engine. This prevents the engine operation from being continued against the will of the operator in the event that the throttle valve fails to recover. When the engine is used as a motor of a vehicle, for example, the running of the vehicle can be stopped, thus assuring a higher safety.

Abstract: A separate oiling type two cycle engine having a diaphragm type float-less carburetor including a metering chamber and a needle valve comprises a fuel reservoir for reserving fuel, a fuel supply port provided at the fuel reservoir for supplying fuel into the fuel reservoir, a fuel passage for connecting the fuel reservoir with the needle valve, a venturi provided immediately upstream of the needle valve, an oil discharge port provided adjacent to the inlet of the venturi for discharging lubricating oil therethrough so as to mix lubricating oil with fuel, and a fuel return port provided at the higher position than the fuel supply port for returning fuel to a fuel tank. Since lubricating oil is supplied to almost all major components of the carburetor, carburetor components such as a choke valve, a throttle valve, fuel passages, jets, metering needles, nozzles and the like can be prevented from being corroded, rusted or clogged by salt water contained in fuel.